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  • CN 51-1277/U
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2001 Vol. 14, No. 5

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Batch Parallel Algorithm of Assignment Problem of Dynamic Transportation Network Flows for System Optimization
DU Wen, LIN Shu-rong, ZΗΟUXian-wei
2001, 14(5): 453-456.
[Abstract](1596)
Abstract:
Intelligent transportation system is a complex integrated system. The study on dynamic transportation network assignment is one of its key techniques and is also the frontier and hot point of transportation science. In this paper, according to a model on the assignment problem of dynamic transportat...
On the Connection between Optimal Stock Level and Distribution Structure in Multi-Echelon Storage System
ZHOUHe-fang, LI Zong-ping, DU Wen
2001, 14(5): 457-461.
[Abstract](1396)
Abstract:
In a single-echelon system, the optimal stock level has a square root rule-of-thumb with respect to the furcation degree. For a multi-echelon storage system, the connection between its optimal stock level and distribution structure (echelon number and furcation degree) is obtained by combination of ...
A Model for Adjustment of Prices of Transportation Enterprises
JU Ting-Ying
2001, 14(5): 462-464.
[Abstract](1453)
Abstract:
How to rationally adjust transportation prices under government’s lenient price control policy is the key problem of raising economic benefits and improving competitive ability for transportation enterprises. In this paper, a price adjustment model is put forward by using economic principles, and an...
The Air Speed Stability under Wind Shear
WANG Yong-zhong, DU Wen
2001, 14(5): 465-467.
[Abstract](1463)
Abstract:
A mathematical model is established to study the air speed stability. The numerical results of the mathematical model are analyzed, revealing that an air stability parameter, namely the hour constant, is related with the air speed, the wind load, the resistance coefficient and the airplane size. Thi...
A Permutation Algorithm for the Linear 0-1 Programming Model
LI Ying-hong
2001, 14(5): 468-471.
[Abstract](1383)
Abstract:
This paper presents a new method, the permutation algorithm, for solving the linear 0-1 programming model. In this algorithm, the unconstrained solutions are permuted in a special order according to the absolute values of variable coefficients of the objective function so as to search the optimum so...
Chaotic Attractor-Based Time Series Forecasting Method and Its Application
XIANG Xiao-dong, GUO Yao-huang
2001, 14(5): 472-475.
[Abstract](1360)
Abstract:
The phase space reconstruction technique and the computation method of chaotic attractor’s correlation dimensions are introduced. The forecasting principle and the forecasting model based on the peculiarities of chaotic attractors are expounded, deficiencies existing in the present model are disclos...
Nonlinear Programming Algorithms for Nonlinear Least Squares Adjustment by Parameters
FAN Dong-min
2001, 14(5): 476-481.
[Abstract](1531)
Abstract:
Five feasible nonlinear programming algorithms dealing with nonlinear least squares adjustment by parameters are discussed. They are Newton method, speediest descending method, discrete Newton method, quasi-Newton method, and sequential quadratic programming method (SQPM). It is confirmed by analysi...
The Spatio-Temporal Data Model fo 3-D Spatial Process Simulation
ZHANG Shan-shan, ZHAO Can-hui
2001, 14(5): 481-485.
[Abstract](1412)
Abstract:
Current Geographic Information System ( GIS) software does not support the manipulation of multi-dimensional spatio-temporal data, therefore it is difficult to deal with the geographic phenomena with spatio-temporal multi-dimensions. Spatial process simulation is the main way to study the geographic...
Internal Force Calculation of Beams with Prestressed Anchor-Rope on Foundation
SONG Cong-jun, ZHOU De-pei, XIAO Shi-guo
2001, 14(5): 486-490.
[Abstract](1637)
Abstract:
The calculation methods of internal forces in beams with prestressed anchor-rope on foundation in high slope project are discussed based on Winkler s hypothesis, and the beam on half- space elastic foundation, respectively. These methods are compared with each other in the internal force calculation...
Test Study on Segmental Model of a PPC Box Girder
LIU Shan-hong, HE Guang-han
2001, 14(5): 491-494.
[Abstract](1518)
Abstract:
The model test of the No. 0 segment of a partially prestressed concrete (PPC) continuous box girder designed for Guangzhou-Zhuhai railway is introduced in this paper. This segmental model is analyzed with three-dimensional finite element. The test and calculation results show that, even under the mo...
Safety Management of Track Irregularities of 250 km/h High-Speed Railway
CHEN Guo, ZHAI Wan-ming, ZUO Hong-fu
2001, 14(5): 495-499.
[Abstract](1606)
Abstract:
Using the vertical-lateral model of vehicle-track coupling system, which is set up based on the vehicle-track coupling dynamics, and taking the coexistence of manifold wavelengths into account, the management values of various track irregularities in 250 km/h high-speed railway are calculated by sim...
Research Review on Rail Corrugation
ZHANG Bo, LIU Qi-yue
2001, 14(5): 500-504.
[Abstract](1349)
Abstract:
Rail corrugation is a complex problem that railway enterprises all over the world are eager to solve. In this paper, researches on rail corrugation in recent years are reviewed, and the status quo in this research field is investigated. In the mean time, current perspectives about the classification...
Analysis of Partial Coefficients of Single-Track Railway Tunnel Portal Structures
ZHOUJia-mei, YAN Song-hong, WANG Ying-xue
2001, 14(5): 505-508.
[Abstract](1837)
Abstract:
According to the calculation characteristics of railway tunnel portal structure, the limit states design equations of tunnel portal structure reliability are established. Based on the given object reliability indexβnom, the partial coefficients of tunnel portal structure are calculated, and the basi...
A Spatial Time-Varying Coupling Model for Dynamic Analysis of High Speed Railway Subgrade
SU Qian, CAI Ying
2001, 14(5): 509-513.
[Abstract](1401)
Abstract:
According to the working condition of high-speed railway, a spatial time-varying model of subgrade/track/vehicle coupling system is established for dynamic analysis of subgrade. In the spatial model, the railway structure and vehicle are dispersed into different elements, the dynamic equation of the...
Surface Water Quality Influenced by the Groundwater Drained from Qinling Tunnel
WANG Jian-xiu, YANG Li-zhong, LIU Dan
2001, 14(5): 514-517.
[Abstract](1544)
Abstract:
The groundwater from Qinling tunnel on Xi’an-Ankang railway is drained into two rivers-the south into Taiyu river, and the north into Shibianyu river. In order to evaluate the influence of chemical abnormal quality the drained groundwater, the water quality of the two rivers is observed and tested i...
Control Factors of Anaerobic Digestion and Effect of pH and Eh
LI Gang, YANG Li-zhong, OU Yang-feng
2001, 14(5): 518-521.
[Abstract](1219)
Abstract:
Anaerobic digestion is one of the key technologies for modern wastewater treatment. In this paper, the control factors of anaerobic digestion are discussed based on the summarization of present research literatures. The mechanism of the effect of pH and Eh on anaerobic digestion is analyzed with mic...
Global Stability of Delayed Hopfield Neural Network Models
ZHANG Ji-ye, YANG Yi-ren, ZENG Jing
2001, 14(5): 522-525.
[Abstract](1618)
Abstract:
The existence of equilibrium and global stability are analyzed for delayed Hopfield neural network models, which have no the original requirements for monotonicity and differentiability in the activation function. By using M matrix theory, Liapunov functionals are constructed to establish the suffic...
Regulating Method and Parameters Design for Preventingthe Loss of Control in Traction Motor Feedback Tests
HUHan-chun
2001, 14(5): 526-529.
[Abstract](1416)
Abstract:
The loss of control of current or voltage in traction motor feedback tests is analyzed based on voltage balance and power balance, and the restrictive conditions of non-loss of control is obtained. Since the loss of control is caused by the difference in magnetic field characteristics of motors, a m...
A Study on Contact Strength of Helical Gears
HU Song, WEN Ze-feng, JINXue-song
2001, 14(5): 530-535.
[Abstract](1360)
Abstract:
The surface equations of meshing gears and the curve equation of the meshing line are established. With several mathematic software and CAD software as assistance tool and using the theory of three-dimensional elastic bodies in non-Hertz rolling contact, the contact stresses at any point of the mesh...
Some Properties of Filters in Lattice Implication Algebras
WANG Xue-fang, XU Yang, SONG Zhen-ming
2001, 14(5): 536-539.
[Abstract](1281)
Abstract:
Several equivalent conditions for filters are given, and the definition of obstinate filters is introduced. Obstinate filters, maximal implicative filters and maximal positive implicative filters are proved equivalent to each other. It is also concluded that ultrafilters are obstinate filters and ob...
Reconstruction of Wire-frame Model from Orthographic Views
ZHANG Ai-jun, ZHU Chang-qian
2001, 14(5): 540-544.
[Abstract](1466)
Abstract:
A straightforward approach that automatically reconstructs a wire-frame model from three orthographic views is described in this paper. Firstly, all candidate 3-D vertices are generated from 2-D points in each of three orthographic views. Next, all possible connecting relationships between candidate...
The Learning of BP Neural Network Based on Evolutionary Programming
YE Li-sheng, HE Feng-dao
2001, 14(5): 545-548.
[Abstract](1743)
Abstract:
The shortcomings of the traditional methods are point out through the analysis of BP algorithm and genetic algorithm which are commonly applied to BP neural networks. A modified evolutionary programming is proposed to optimize the weight of BP neural network. The simulating results for XOR problem a...
On Secondly Extended Complex-Rotary Codes and Their Dual Codes
JI Qing-bing, HUANG Guang-xin
2001, 14(5): 549-552.
[Abstract](1376)
Abstract:
In this paper, the concepts of secondly extended complex-rotary codes and their dual codes are proposed on the basis of extended complex-rotary codes. Their characters are discussed preliminarily, and the method for their construction and their principle parameters are presented. By comparing the pr...
Model Reference Adaptive Control Based on BP Neural Networks
SHEN Ying, ZHANG Cui-fang
2001, 14(5): 553-556.
[Abstract](1746)
Abstract:
A scheme of model reference adaptive control based on BP neural network is presented in this paper. Two BP neural networks are used to identify and control unknown plants. Since a BP neural network has the properties of forward propagation of message and backward propagation of errors, the parameter...

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